b'AEGC 2023Short abstractsto include a 3D seismic survey to define the Mawson intrusionHere we present a practical workflow integrating a architecture. Seismic imaging was performed in pre-stack timemultimodal mineralogical, petrological, and in-situ migration (PSTM) and pre-stack depth migration (PSDM), andradioisotope characterisation approach that can be petrophysical measurements including P-wave velocity andapplied to a variety of sedimentary rocks. We utilise density obtained from drill core samples were utilised to buildthe Tescan Integrated Mineral Analyzer (TIMA) for the confidence of seismic velocity model. Several wirelineautomated quantitative mineralogical analysis of source and geophysical loggings that have been conducted recently showreservoir rocks including shale, sandstone, and carbonate. a strong correlation with key seismic reflectors associatedSubsequently, we integrate X-ray computed tomography with the chonolith. The resulting seismic cube has enabled(XCT) with TIMA to undertake multimodal mineralogical the chonolith to be mapped below the Mawson Fault, whichand petrological characterisation of samples, and build supports the theory that the intrusion continues at depth belowa 3D visualisation and volumetric reconstruction of the existing drilling programme. mineralogical phases (and organics) and pore space. The resulting multimodal 2D-3D XCT-TIMA mineralogy AusAEM is the worlds largest airborne electromagneticprovides quantitative characterisation of sediments (from a regional basin scale to the local reservoir scale), and (AEM) survey undertaken. identifies appropriate mineral phases for in-situ sedimentary A. Yusen Ley-Cooper geochronology by laser ablation mass spectrometry techniques (e.g., in-situ U-Pb dating of carbonate minerals, in-Geoscience Australia situ Rb-Sr dating of K-bearing minerals, and U-Pb and (U-Th)/He dating of siliciclastic sediments, etc.). The multi-technique Airborne electromagnetics surveys are at the forefront ofworkflow yields quantitative mineralogy and petrology of addressing the challenge of exploration undercover. Theysediments and insights into provenance, diagenesis, and have been an essential element in the regional mappingburial history, with advantages over conventional methods in programmes to build Australias resource potential inventoryterms of sample consumption, time, cost, safety, and spatial and provide information about the subsurface. In collaborationresolution.with State and Territory geological surveys, Geoscience Australia (GA) leads a national scale initiative that aims to acquire AEM data at 20 km line spacing across Australia. Regional modelsGeochemical signatures of key mineral systems and of subsurface electrical conductivity show new undercoverdeposit types in north Queensland, Australia.geological features that could host mineral deposits and groundwater resources. The models enable us to map potentialVladimir Lisitsin, Dhnaram Courteney, Elena Belousova, Paul alteration and structural zones and support environmental andBlake and Friedrich von Gnielinskiland management studies.Geological Survey of QueenslandThe AusAEM programme is rapidly covering areas at a scale never previously attempted. The programmes success lies inMany critical minerals are economically extracted only as the high-resolution, non-invasive nature of the method andby-products of mining of traditional main commodities. its ability to derive subsurface electrical conductivity in threeSignificant gaps of knowledge remain on the geochemistry and dimensionsmade possible by GAs implementation of modernmineralogy of critical minerals in primary deposits of traditional high-performance computing algorithms. The programmecommodities. Geological Survey of Queensland, in collaboration is increasingly acquiring more AEM data, processing it, andwith key Australian research organisations, has undertaken a working towards full national coverage. major multi-year programme of geochemical and mineralogical characterisation of major mineral deposit types and key mineral systems in north Queensland, with a particular focus on critical Application of 2D, 3D and in-situ techniquesminerals.in quantitative characterisation and dating of sedimentary rocks. The main mineral deposit types investigated by this programme to date include: Iron-oxide copper-gold (IOCG, including: Ernest Zhen Li, Martin Wells, Kai Rankenburg, Noreen Evans and BrentHenry, SWAN, Eloise), siliciclastic-carbonate (SEDEX) Zn-Pb-Ag McInnes (Mt Isa Zn-Pb, George Fisher, Dugald River), siliciclastic-mafic (Broken Hill-type) Pb-Ag-Zn (Cannington, Maronan, Pegmont), John de Laeter Centre, Curtin University epigenetic sediment-hosted Cu (Mt Isa Copper, Capricorn Copper), phosphorites (Phosphate Hill, Ardmore); Sn and W Quantitatively characterising source and reservoir rocks,skarns, greisens and veins (Mount Carbine, Wolfram Camp), Zn and placing precise and accurate chronological constraintsskarns (Mount Garnet), Cu-Sn greisens and polymetallic veins on sedimentary and diagenetic processes are critical to(Baal Gammon) and bauxites (Weipa, Aurukun, Bauxite Hill).determining fundamental basinal rock properties and to de-risking exploration for sediment-hosted resources.Samples from each investigated deposit were generally However, the quantitative mineralogical, petrological, andcollected from multiple drillholes, at a downhole spacing geochronological characterisation of sedimentary rocksranging from continuous (phosphorites, bauxites) to 10-50 remains challenging and generally requires meticulousm (large Cu and Zn-Pb-Ag deposits), aiming to characterise and time-consuming activities with non-negligible sampledeposit geochemistry and its variability from central parts of consumption. Addressing these issues requires innovativemain orebodies to distal alteration footprints and regional techniques that can not only maximise the informationbackground. Major and trace element geochemistry (for up gleaned from small or limited sample material, but also enableto 68 elementsincluding all critical metals) was consistently rapid analytical throughput in a safe and cost-effective way. characterised using a consistent combination of exploration 115 PREVIEW FEBRUARY 2023'